I think that info is private and I doubt you'll ever find out. You might be able to learn something by looking at the daily volume for a given period of time.

Market depth - The market's ability to sustain relatively large market orders without impacting the price of the security. This considers the overall level and breadth of open orders and usually refers to trading within an individual security/currency

Not giving an exact figure here but the amount of funds on Britcoin are usually 100x the volume of the market.

But it varies: there was a point where we were getting 3k volume per day and had 10k GBP, 10k BTC.

Usual MtGox volume is 20k, so I'd say they likely have ~200k online.

I think you are off by at least an order of magnitude, or two.The recent volume on MtGox has been over $200K USD per day.100x that would give an estimate of $20M USD in the market on Mt Gox.(I would guess this is high, 10x = $2M USD seems more reasonable at this time)

Not giving an exact figure here but the amount of funds on Britcoin are usually 100x the volume of the market.

But it varies: there was a point where we were getting 3k volume per day and had 10k GBP, 10k BTC.

Usual MtGox volume is 20k, so I'd say they likely have ~200k online.

I think you are off by at least an order of magnitude, or two.The recent volume on MtGox has been over $200K USD per day.100x that would give an estimate of $20M USD in the market on Mt Gox.(I would guess this is high, 10x = $2M USD seems more reasonable at this time)

He said Britcoin.

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as far as i know there is no limit in funding a mtgox with USD balance.....

considering $1000USD is the withdrawl limit to withdraw BTC worth or USD balance each day, i would say theres a good chance people have multiple accounts and are maxing their daily limits, as well as having alot of faith in mtgox not to go under, domain is still registered in the USA

considering $1000USD is the withdrawl limit to withdraw BTC worth or USD balance each day, i would say theres a good chance people have multiple accounts and are maxing their daily limits, as well as having alot of faith in mtgox not to go under, domain is still registered in the USA

Not a problem if mtgox owner registered a namecoin domain, which is censor resistant.